Hello, the 350 is a great rifle.
Like someone else said, don't believe all you read.
Every rifle has its own personality that you have to learn.
If its already shooting great for you, then read up on some points about hold and so forth.
You will be amazed at how just holding your rifle differently will affect it.
Now about the tune, It's nothing that has to be done but I will say this.
If you really like your rifle now, you will be absolutely in love with it after a tune.
I had a Gamo done by CDT, man did it make a nice rifle.
My only problem was learning how to shoot the dear thing.
Once I found what she liked, she was very nice to and for me.
The same will hold true to your RWS. If Charlie could do what he did for mine,
I would live to see what Charlie or Gene could do for that.
Have a great day and welcome to the best forum around.
ShadowShot